TABLE OF CONTENTS. XXI 



PART V. 



PKOTECTION AGAINST NON-ATMOSPHERIC NATUEAL 

 PHENOMENA. 



CHAPTER I. 



PKOTECTION AGAINST DAMAGE BY WATEK. 



PAGE 



SECTION I. SOIL-DENUDATION 582 



SECTION IV. DBAINAGE. 



1. Vertical drainage 604 



2. Surface drainage 604 



3. Covered drains . 612 



CHAPTER IT. 

 PROTECTION AGAINST AVALANCHES . . . .616 



CHAPTER III. 



PROTECTION AGAINST SHIFTING SAND. 



SECTION I. SAND DUNES. 



1. Description 621 



2. Construction of littoral dune 623 



3. Material for fixing the sand '. . 624 



4. Maintenance of the littoral dune . . . . .* . . 625 



5. Protective coast forest zone 626 



SECTION II. INLAND SAND. 



1. Description 630 



2. Protective rules 630 



3. Fixation of the sand . . . 631 



4. Stocking the area 634 



